老师在想是谁在黑板上写的留言。
The teacher wondered who had written the note on the board.
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wondered英 /ˈwʌndəd/|美 /ˈwʌndərd/
had英 /hæd/|美 /hæd/
解释
主句 wondered 为一般过去时表达间接疑问，从句 had written 用过去完成时转述更早发生的书写动作。
The teacher wondered who had written the note on the board.
主句 wondered 为一般过去时表达间接疑问，从句 had written 用过去完成时转述更早发生的书写动作。